000 00327 a2200145 4500
082 _a005.446
_bMSD
090 _c30629
_d53860
245 _aMS-DOS 2.0
300 _avii, 383p.
_c21cm.
650 _aComputer Science
650 _aComputer Language
650 _aOperating System
650 _aSystem Programming
942 _cL
999 _c57138
_d57138